Support angles and hangers are the common products for suspension of rectangular or spiral ducts. They are usually attached to the ductwork by screws or rivets. Hangers are a cost-effective and easy-to-use solution for the suspension of ventilation ducts. The Gebhardt support angles and hangers are fully assembled with improved sound insulation and have been tested to DIN 4109 (structure-borne sound test on request) The average improvement is: Between 125 Hz and 4000 Hz: 7 dB; Between 500 Hz and 4000 Hz: 10 dB (tested by the Institut für Schall- und Wärmeschutz, Essen). All hangers and support angles are galvanised and assembled with a patented, screwable insulation element with washer. Suitable for use of threaded rods Ø 10 mm.